From: John Maier <JohnAM@datastorm.com>
To: "'netbsd-help'" <netbsd-help@NetBSD.ORG>
Subject: Why is SLIP so slow on a dial up, but fast on a direct connect?
Date: Fri, 29 Sep 95 09:07:00 PDT
Message-Id: <306C189B@ms-mail.datastorm.com>
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Sender: owner-netbsd-help@NetBSD.ORG
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I've a external Supera 28.8 off of my server (486DX2-66, 8megs, 16550   
UART) with the port set to 38400. I am connecting to the server with   
another Supera 28.8.

I have noticed a strange thing, if I directly connect to the server with   
a serial line, I can get outstanding transfer rates.  When I replace the   
line with the modem and dial up (from a PC running Trumpet, or anything   
else), the rates are terrible (lots of pauses from the server).

I tried turning off compression, and error corrections, but this didn't   
really help.

Some the things I notice are, if the link is left idle for a moment and   
then a FTP xfer is started, initially the rate is fairly quick (2800   
bytes/sec) and begins quickly to drop to 400 bytes/sec.  Telnet exhibits   
the same problems.

What's up?  Has anyone else seen this.  BTW this is the second machine   
I've setup that exhibits these problems.

jam

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